Cutaneous Perception

Touch:

Skin Types: 2 types

Hairy Skin:

 

Glabrous Skin:

 

 

Skin Layers:

Epidermis:

 

Dermis:

 

Subcutaneous tissue:

 

 

 

 

Mechanoreceptors: - respond to mechanical stimulation of skin.

Slowly Adapting (SA) fibers:

 

 

Merkel Receptor: (SA1)

 

 

 

 

Ruffini Cylinder: (SA2)

 

 

 

Rapidly Adapting (RA) fibers:

 

 

Meissner Corpuscle: (RA1)

 

 

 

 

 

 

 

Pacinian Corpuscle: (RA2)

 

 

 

 

Density of Nerve Fibers:

 

Two-point thresholds:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Organization of Touch in the Brain:

Brain's Receptive Fields:

 

 

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Topographical Organization:

 

 

 

 

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Passive vs Active Touch:

 

Passive:

 

Active:

 

 

 

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• Manner of active touch is determined by properties of the object.

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• Active touch linked with kinesthesis and proprioception.

Kinesthesis:

 

Proprioception:

 

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Temperature: